Dynamometers for deep well pump installations



E. LODYNSKI 3,004,426

DYNAMOMETERS FOR DEEP WELL PUMP INSTALLATIONS Oct. 17, 1961 Filed Jan.29, 1958 M 1 BY Qwm INVENTOR ATTORNEY tes Patent 3,004,426 Patented Oct.17, 1961 3,004,426 DYNAMOMETERS FOR DEEP WELL PUMP INSTALLATIONS EmilLodynski, 21 Badstrasse, Modling, Lower Austria, Austria Filed Jan. 29,1958, Ser. No. 711,999 6 Claims. (Cl. 73-441) The present inventionrelates to a dynamometer arrangement of the type used for controllingthe operation of deep well'pumps, particularly in oil wells.

The dynamometers used for this purpose consist substantially of apressure sensing device, to which the loads acting on the pump rods aretransmitted and the pressure readings of which are recorded by arecording measuring instrument on a sheet, which is reciprocated inunison with the up and down motion of the pump rod. "To be able tofulfil its purpose the pressure sensing device must be inserted in theforce-transmitting line of the pump rod. More particularly, the pressuresensing device is inserted between the upper end of the pump and properand the suspension device.

For the insertion of the usual types of these dynamometers the pump mustbe shutdown, the pump rod must be provided with an additional supportand must be separated from the suspension device before the sensingdevice can be inserted. These steps mustbe performed in the reverseorder for the removal. This temporary stand- 'still of the pump has thedisadvantage that the subsequent measurements may be wrong becauseduring this interruption of the operation of the pump the sand suspendedin the liquid can settle on the pump piston and obstruct the operationof the pump considerably. in adverse cases this may even cause seizingof the piston.

It is the main object of the present invention to provide a dynamometerarrangement which eliminates said disadvantage of the known arrangement,because it enables a gradual insertion of the pressure sensing deviceinto the force-transmitting line in such a manner, that the load isgradually taken over by the sensing device without interruption of theoperation of the pump.

It. is another object of the present invention to prointerruption of theoperation of the pump.

It is yet another object of the present invention to provide adynamometer arrangement, wherein the insertion '0f :a pressure gaugeinto the force-transmitting line without interruption of the operationof the pump is achieved by a pressure cylinder having a piston,'theposition of .which is variable by pressure liquid pumped into the 'same.

The cylinder and piston are inserted between a stop at the top end ofthe pump rod and the cross head of the pump andthe piston (or cylinder)is raised by the introduction of liquid eflected by means of a hand pumphaving a high transmission ratio until said stop .is

lifted sufiiciently to take up the load of the pump rod; in this waythis load is transmitted by the pressure liquid in the cylinder to thecross-head. The recording dyna- 'mometer is connected tothe pressurechamber of the pump cylinder and records the load carried by the pumprod. v

In apreferred form of such arrangement a base plate .carries twopressure cylinders, each of which has a piston slidably arrangedtherein. These pistons are alsorigidly connected to each other by aplate or the like. in addition, a pair of hooks is afiixed either to thecylinder or piston and can be hung on a pair of pins provided at the rodhead. Thus the suspension device is located in such manner that theplate, which connects the cylinders, engages the cross head and theplate, which connects the pistons, engages the underside of two stopsattached to the rod head, or vice versa, when the pairs of pistons andcylinders are swung into position. 7

With these and other objects in view which will become apparent in thefollowing detailed description, the present invention will be clearlyunderstood in connection with the accompanying drawings, in which:

FIG. 1 is a front perspective view of the rod head and the cross headbefore the mounting of the pressure sensing device; and

FIG. 2 is a front perspective view of the rod head and the cross headjointly with the mounted pressure sensing device.

Referring now to the drawing, the ropes 8, which carry the cross head 9,depend from the so-called horsehead of the pump lever, which isoscillated by a motor. The rod 11 of the deep well pump extends througha bore in the cross head 9 and has at its top end the actual rod head 3!Contrary to the usual arrangement, the rod head 30 does not restdirectly on the-cross head 9 but, is spaced from the cross head 9 byseveral sleeves 26, 26',

'27 and 29 passed over the pump rod 11. The sleeve 27 has mutuallyopposite outward projections 25 and hearing pins 28 also projectingoutwardly in opposite directions and spaced above the projections 25.The sleeves 26, 26 and 29 serve only for adjusting the correct distancebetween parts 9, 25 and 30. The sleeve 26 serves also to enable a checkwhether the load has already been taken over by the cylinder; in thiscase the sleeve 26' is easily rotatable.

The device for taking over the pressure consists of two hydraulicpressure cylinders 31 and pressure pistons (plungers) 32 adjustabletherein and firmly connected to each other by a plate 33, which has acentral recess 34, which receives the sleeve 27. Upwardly extendinghookshaped grippers 35 disposed on both sides of this recess serve forhanging the device into the bearing pins 28.

The two cylinders 31 are also carried by a plate 36,

.which connects the cylinders and has a recess receiving the spacersleeve 26. Pressure conduits 37 extend to the pressure chamber of asmall piston pump 38, which is ,operableby a cam 39 driven by a handlever 40 (or pressure is connected to the bore 47 of the piston pump Themode of operation is as follows:

To check the performance of the pump, the hooks 35 of the pressuresensing device are hung on the pins 28, to cause the pressure sensingdevice to swing automatically in the position of operation. This issuitably efiected when the vertically reciprocating pump rod 11 is inits lowest position. In the position of operation of the pressuresensing device the plate 33 lies somewhat below the stops 25 and theplate 36 rests on the cross head 9. Now the pump 38 is operated by meansof the hand lever 40 to pump liquid into the cylinders 31 whereby thepistons 32 are lifted to engage the underside of the projections 25 and,as the operation of the pump is continued, to lift the same togetherwith the sleeve 27 and the rod head 30 sufiiciently until the load ofthe pump rod 11 no longer rests by means of the sleeve 26, 26" on thecross head 9, but is now carried by the plate 33 and consequently by thepiston 32. In this way the hydraulic pressure space in the cylinders 31is inserted in the force-transmitting line and the recording device 55indicates with the pressure in the cylindersjl also the entire loadapplied to the rod head 30. This load is recorded by the recordingdevice, e.g., in the form of a diagram. During the slow up and downmovement of the cross head 9 the pump 38 may easily be operated by anoperator standing beside the pump 38, preferably in the lowest part ofthis up and down movement, by such an increment that the pressuresensing device is inserted into the force-transmitting line. The sensingdevice can be removed in the same manner simply by operating the cock 44to permit the pressure liquid to drain into the reservoir 43. As aresult, the cylinders 31 are lowered and the load of the pump rod 11 isdirectly transmitted by the sleeves 26, 26' to the cross head 9. Theentire pressure sensing device can then be removed simply by an outwardpivotal movement and lifting from the pins 28.

A pressure recorder is connected to the bore 47 of the piston pump 38and comprises a pressure cylinder 50 in which a piston 51 is insertedand biased by a spring 52. A scriber 53 is pivotally mounted by a pivot54 on a frame at its rear end and secured intermediate its ends to thepiston rod 51 while its opposite end forms a point to record theprevailing pressure on a diagram sleeve 55 rotated by a pull wire 56which is wound on the drum 56.

For this reason a single device of this kind can be used for obtainingsuccessively a recording of the pressure curve of any desired number ofdeep well pumps which 'are in operation. For this purpose it is onlynecessary to provide in each of these pumps the rod head with the sleeve27.

The arrangement according to this application enables also an adjustmentof the altitude of the piston of the deep well pump incorporated in thewell relative to the cylinder during operation. This adjustment has thepurpose of eliminating certain disturbances in the operation of the deepWell pump.

While I have disclosed one embodiment of the present invention,'it is tobe understood that this embodiment is given by example only and not in alimiting sense, the scope of the present invention being determined bythe objects and the claims.

What is claimed is:

1. In a deep well pumping installation, particularly for the pumping ofoil from deep wells, the combination of a vertically reciprocating pumprod, a vertically reciproeating carrying member assuming the load fromsaid pump rod and having a top face, means for transferring the load ofsaid pump rod onto said carrying member during normal pumping operationand having a lower end face, said lower end face of said loadtransferring means abutting the top face of said carrying member, saidload transferring means having at least one lateral projection, with atleast one hydraulic pressure unit comprising a pressure cylinder and apiston reciprocating therein, said hydraulic pressure unit supported bysaid carrying member and said bottom face of said lateral projectionresting on said hydraulic pressure unit in the operative position of thelatter, a pump operatively connected with said pressure cylinder andfeeding the latter, in order to lift said pressure cylinder and saidpiston, respectively, and said hydraulic pressure unit assuming the loadof said pump rod, thereby lifting said lower end face of said loadtransferring means from said top face of said carrying member, and apressure responsive recording member operatively connected with saidhydraulic pressure unit.

2. The pumping installation, as set forth in claim 1, wherein said loadtransferring means comprises a member surrounding the upper end of saidpump rod and having a lower end face for transfer of the load of saidpump rod to said carrying member, and said member having two of saidlateral projections for operative connection thereof with said hydraulicpressure unit.

3. The pumping installation, as set forth in claim 1, wherein said loadtransferring means includes a head rigidly secured to the upper end ofsaid pump rod and at least one cylindrical sleeve loosely mounted onsaid pump rod, said cylindrical sleeve carrying said lateral projectionfor connection of the latter to said carrying memher.

4. In a deep well pumping installation, particularly for the pumping ofoil from deep wells, the combination of a vertically reciprocating pumprod, a vertically reciproeating carrying member assuming the load fromsaid pump rod and having a top face, means for transferring the load ofsaid pump rod onto said carrying member during normal pumping operationand having a lower end face, said lower end face of said loadtransferring means abutting the top face of said carrying member, saidload transferring means having at least one lateral projection, with atleast one hydraulic pressure unit comprising apressure cylinder and apiston reciprocating therein, said hydraulicpressure unit engaging saidpump rod and laterally removably supported by the top face of saidcarrying member and said bottom face of said lateral projection restingon said hydraulic pressure unit in the operative position of the latter,and a pump operatively connected with said pressure cylinder and feedingthe latter in order to lift said pressure cylinder and said piston,respectively, and said hydraulic pressure unit assumingthe load of saidpump rod, thereby lifting said lower end face of said load transferringmeans from said top face of said carrying member, and a pressureresponsive recording member operatively connected with said hydraulicpressure unit.

5. In a deep well pumping installation, particularly for the pumping ofoil from deep wells, the combination of a vertically reciprocating pumprod, a vertically reciprocating carrying member assuming the load fromsaid pump rod and having a top face, means for transferring the load ofsaid pump rod onto said carrying member during normal pumping operationand having a lower end face, said lower end face of said loadtransferring means abutting the top face of said carrying member, saidload transferring means having at least one lateral projection, with atleast one hydraulic pressure unit comprising a pressure cylinder and apiston reciprocating therein, said hydraulic pressure unit supported bysaid carrying member and said bottom face of said lateral projectionresting on said hydraulic pressure unit in the operative position of thelatter, a pump operatively connected with said pressure cylinder andfeeding the latter, in order to lift said pressure cylinder and saidpiston, respectively, and said hydraulic pressure unit assuming the loadof 1 said pump rod, thereby lifting said lower end face of said loadtransferring means from said top face of said carrying member, apressure responsive recording member operatively connected with saidhydraulic pressure unit, said lateral projection comprising atransversely outwardly protrudingcarrying pin attached to said loadtransferring means, and at least one carrying hook attached to saidpiston and cylinder, respectively, for hanging said cylinder and pistonthereon'in order to facilitate the insertion of said hydraulic pressureunit between said carrying member and said lateral projection.

6. In a deep well pumping installation, particularly for the pumping ofoil from deep wells, the combination of a vertically reciprocating pumprod, a vertically reciproeating carrying member assuming the load fromsaid pump rod and having a top face, means for transferring the load ofsaid pump rod onto said carrying member during normal pumping operationand having a lower end face, said lower end face of said loadtransferring means abutting the top face of said carrying member, saidload transferring means having at least one lateral projection, withatleast one hydraulic pressure unit comprising a pressure cylinder and apiston reciprocating h e id hytlIfi-llliepressure unit supported by saidcarrying member and said bottom face of said lateral projection restingon said hydraulic pressure unit in the operative position of the latter,a pump operatively connected with said pressure cylinder and feeding thelatter, in order to lift said pressure cylinder and said piston,respectively, and said hydraulic pressure unit assuming the load of saidpump rod, thereby lifting said lower end face of said load transferringmeans from said top face of said carrying member, a pressure responsiverecording member operatively connected with said hydraulic pressureunit, said load transferring means comprising a member surrounding theupper end of said pump rod and having a lower end face for transfer ofthe load of said pump rod to said carrying member, said lateralprojections comprising carrying pins attached to said member surroundingsaid upper end of said pump rod, and two carrying hooks attached to saidpiston and cylinder, respectively, for hanging said cylinder With saidpiston thereon, in order to facilitate the insertion of said hydraulicpressure unit between said carrying member and said lateral projections.

References Cited in the file of this patent UNITED STATES PATENTS1,091,599 Stephens ---4 Mar. 31, 1914 1,934,201 Miller Nov. 7, 19332,380,362 Hem July 10, 1945 2,741,915 Renken et a1. Apr. 17, 1956

